NM CID MM-2 Practice Questions - New Mexico CID MM-2 Natural Gas Fitting Examination Exam

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A dwelling has an 80,000 Btu/h furnace and a 40,000 Btu/h water heater on 1,000 Btu/cf natural gas. Longest developed length is 40 feet. The UMC table row at 40 feet lists 1/2 inch = 81 CFH and 3/4 inch = 170 CFH. What is the smallest branch that may serve only the water heater?

1/2 inch, because 40 CFH is less than 81 CFH at the 40-foot longest length 3/8 inch, because 40 CFH always fits 3/8 inch 3/4 inch, because every branch must match the main 1 inch, because water heaters require 1-inch connectors

Correct Answer:

1/2 inch, because 40 CFH is less than 81 CFH at the 40-foot longest length

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